Spain made claims of prior discovery for the northwest coast of North America by citing the voyages of Cabrillo in 1542, Ferrelo in 1543, and Vizcaino in 1602–03.
He decided to send an embassy to Japan in the person of the famous explorer Sebastián Vizcaíno.
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He received in 1610 the embassy of Luis Sotelo and Tanaka Shōsuke, which had sailed from Japan on the Japanese sailship San Buena Ventura, and agreed to send an ambassador to Japan in the person of the famous explorer Sebastián Vizcaíno, with the added mission of exploring the "gold and silver islands" which were thought to be east of the Japanese isles.